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' Figure lA shows the location of the site investigation area. Depetding upon the amount of <br />work required, one or more test pits will be excavated in the area. One pit will re~ii re a <br />dozer to prepare a bench for the backhce. However, as stated above topsoil will be salvaged <br />rom the area prior to o~mpncirg bench wnstruction or pit excavation. The bench and pit <br />ill be backfilled when no longer needed. The pit areas will be backfilled arri the topsoil <br />will be redistributed arri seeded with the rar~gelarrl seed mixture. Drainage frmn the area is <br />controlled by Pond D. <br />Ditch D-1 will be tempar'arily rerouted in fran of the lobe facility to allow for better <br />working corrlition. After the site project has been cor~leted it will be returned to its <br />original location. <br />In order to cwig~lete the site investigation a number of shallaa monitoring wells were <br />installed to delineate the extent of diesel plume. In addition to the existing wells two <br />additional wells will be completed in the area. The ann~~~++~te location of the wells are <br />shown on Figure 10, Investigation Site Area. If required, additional holes may be drilled <br />and the wells wnstructed in them. <br />The wells will be drilled with a mobile auger rig, arri as such, no road work is anticipated. <br />If a road is required the topsoil will be bladed to the side and temporarily stockpiled. <br />•~fter the work is ca~leted the topsoil would be redistributed over the road. <br />The wells will range in depth frcun app~-~Y~~tely 20-80 feet. The wells will be constructed <br />of 2 or 4 inch PVC. Normal monitoring aryl construction procedures will be used when the <br />wells are built, e.e. use of clean gravel pads, correctly sized screen, and surface plug. <br />When the wells are no lorger needed the wells will be plugged with grout. The wells will be <br />cut off three feet below grade aryl then grouted from the bottom up. This plugging procedure <br />applies to all of the wells at the site. <br />Railroad <br />The railroad track was extended approximately 30o feet in 1987. The details of the extension <br />are enumerated within Minor Revision 87-12. <br /> <br />MR 90-71 Permit Renewal 780-30-3 Revised 07/30/91 <br />